Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
3dcf5451 | 2 | * ext4.h |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/include/linux/minix_fs.h | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | */ | |
15 | ||
3dcf5451 CH |
16 | #ifndef _EXT4_H |
17 | #define _EXT4_H | |
ac27a0ec DK |
18 | |
19 | #include <linux/types.h> | |
3a5b2ecd | 20 | #include <linux/blkdev.h> |
ac27a0ec | 21 | #include <linux/magic.h> |
2ccb5fb9 | 22 | #include <linux/jbd2.h> |
60e58e0f | 23 | #include <linux/quota.h> |
d444c3c3 TT |
24 | #include <linux/rwsem.h> |
25 | #include <linux/rbtree.h> | |
26 | #include <linux/seqlock.h> | |
27 | #include <linux/mutex.h> | |
ca0faba0 TT |
28 | #include <linux/timer.h> |
29 | #include <linux/wait.h> | |
30 | #include <linux/blockgroup_lock.h> | |
31 | #include <linux/percpu_counter.h> | |
c9de560d | 32 | |
ac27a0ec | 33 | /* |
8a35694e | 34 | * The fourth extended filesystem constants/structures |
ac27a0ec DK |
35 | */ |
36 | ||
37 | /* | |
617ba13b | 38 | * Define EXT4FS_DEBUG to produce debug messages |
ac27a0ec | 39 | */ |
617ba13b | 40 | #undef EXT4FS_DEBUG |
ac27a0ec | 41 | |
ac27a0ec DK |
42 | /* |
43 | * Debug code | |
44 | */ | |
617ba13b MC |
45 | #ifdef EXT4FS_DEBUG |
46 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 47 | do { \ |
af5bc92d | 48 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
4db9c54a | 49 | __FILE__, __LINE__, __func__); \ |
af5bc92d | 50 | printk(KERN_DEBUG f, ## a); \ |
ac27a0ec DK |
51 | } while (0) |
52 | #else | |
617ba13b | 53 | #define ext4_debug(f, a...) do {} while (0) |
ac27a0ec DK |
54 | #endif |
55 | ||
273df556 | 56 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
24676da4 | 57 | ext4_error_inode(__func__, (inode), (fmt), ## a) |
273df556 FM |
58 | |
59 | #define EXT4_ERROR_FILE(file, fmt, a...) \ | |
24676da4 | 60 | ext4_error_file(__func__, (file), (fmt), ## a) |
273df556 | 61 | |
d444c3c3 TT |
62 | /* data type for block offset of block group */ |
63 | typedef int ext4_grpblk_t; | |
64 | ||
65 | /* data type for filesystem-wide blocks number */ | |
66 | typedef unsigned long long ext4_fsblk_t; | |
67 | ||
68 | /* data type for file logical block number */ | |
69 | typedef __u32 ext4_lblk_t; | |
70 | ||
71 | /* data type for block group number */ | |
72 | typedef unsigned int ext4_group_t; | |
73 | ||
296c355c TT |
74 | /* |
75 | * Flags used in mballoc's allocation_context flags field. | |
76 | * | |
77 | * Also used to show what's going on for debugging purposes when the | |
78 | * flag field is exported via the traceport interface | |
79 | */ | |
d444c3c3 | 80 | |
c9de560d | 81 | /* prefer goal again. length */ |
0ef90db9 | 82 | #define EXT4_MB_HINT_MERGE 0x0001 |
c9de560d | 83 | /* blocks already reserved */ |
0ef90db9 | 84 | #define EXT4_MB_HINT_RESERVED 0x0002 |
c9de560d | 85 | /* metadata is being allocated */ |
0ef90db9 | 86 | #define EXT4_MB_HINT_METADATA 0x0004 |
c9de560d | 87 | /* first blocks in the file */ |
0ef90db9 | 88 | #define EXT4_MB_HINT_FIRST 0x0008 |
c9de560d | 89 | /* search for the best chunk */ |
0ef90db9 | 90 | #define EXT4_MB_HINT_BEST 0x0010 |
c9de560d | 91 | /* data is being allocated */ |
0ef90db9 | 92 | #define EXT4_MB_HINT_DATA 0x0020 |
c9de560d | 93 | /* don't preallocate (for tails) */ |
0ef90db9 | 94 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
c9de560d | 95 | /* allocate for locality group */ |
0ef90db9 | 96 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
c9de560d | 97 | /* allocate goal blocks or none */ |
0ef90db9 | 98 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
c9de560d | 99 | /* goal is meaningful */ |
0ef90db9 | 100 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
d2a17637 | 101 | /* blocks already pre-reserved by delayed allocation */ |
0ef90db9 | 102 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
4ba74d00 TT |
103 | /* We are doing stream allocation */ |
104 | #define EXT4_MB_STREAM_ALLOC 0x0800 | |
d2a17637 | 105 | |
c9de560d AT |
106 | |
107 | struct ext4_allocation_request { | |
108 | /* target inode for block we're allocating */ | |
109 | struct inode *inode; | |
726447d8 ES |
110 | /* how many blocks we want to allocate */ |
111 | unsigned int len; | |
c9de560d AT |
112 | /* logical block in target inode */ |
113 | ext4_lblk_t logical; | |
c9de560d AT |
114 | /* the closest logical allocated block to the left */ |
115 | ext4_lblk_t lleft; | |
c9de560d AT |
116 | /* the closest logical allocated block to the right */ |
117 | ext4_lblk_t lright; | |
726447d8 ES |
118 | /* phys. target (a hint) */ |
119 | ext4_fsblk_t goal; | |
120 | /* phys. block for the closest logical allocated block to the left */ | |
121 | ext4_fsblk_t pleft; | |
122 | /* phys. block for the closest logical allocated block to the right */ | |
c9de560d | 123 | ext4_fsblk_t pright; |
c9de560d | 124 | /* flags. see above EXT4_MB_HINT_* */ |
498e5f24 | 125 | unsigned int flags; |
c9de560d AT |
126 | }; |
127 | ||
e35fd660 TT |
128 | /* |
129 | * Logical to physical block mapping, used by ext4_map_blocks() | |
130 | * | |
131 | * This structure is used to pass requests into ext4_map_blocks() as | |
132 | * well as to store the information returned by ext4_map_blocks(). It | |
133 | * takes less room on the stack than a struct buffer_head. | |
134 | */ | |
135 | #define EXT4_MAP_NEW (1 << BH_New) | |
136 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) | |
137 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) | |
138 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) | |
139 | #define EXT4_MAP_UNINIT (1 << BH_Uninit) | |
140 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ | |
141 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ | |
142 | EXT4_MAP_UNINIT) | |
143 | ||
144 | struct ext4_map_blocks { | |
145 | ext4_fsblk_t m_pblk; | |
146 | ext4_lblk_t m_lblk; | |
147 | unsigned int m_len; | |
148 | unsigned int m_flags; | |
149 | }; | |
150 | ||
b3a3ca8c TT |
151 | /* |
152 | * For delayed allocation tracking | |
153 | */ | |
154 | struct mpage_da_data { | |
155 | struct inode *inode; | |
156 | sector_t b_blocknr; /* start block number of extent */ | |
157 | size_t b_size; /* size of extent */ | |
158 | unsigned long b_state; /* state of the extent */ | |
159 | unsigned long first_page, next_page; /* extent of pages */ | |
160 | struct writeback_control *wbc; | |
161 | int io_done; | |
162 | int pages_written; | |
163 | int retval; | |
164 | }; | |
c7064ef1 | 165 | #define EXT4_IO_UNWRITTEN 0x1 |
0031462b | 166 | typedef struct ext4_io_end { |
8d5d02e6 | 167 | struct list_head list; /* per-file finished AIO list */ |
0031462b | 168 | struct inode *inode; /* file being written to */ |
8d5d02e6 | 169 | unsigned int flag; /* unwritten or not */ |
744692dc | 170 | struct page *page; /* page struct for buffer write */ |
a1de02dc ES |
171 | loff_t offset; /* offset in the file */ |
172 | ssize_t size; /* size of the extent */ | |
0031462b MC |
173 | struct work_struct work; /* data work queue */ |
174 | } ext4_io_end_t; | |
175 | ||
ac27a0ec DK |
176 | /* |
177 | * Special inodes numbers | |
178 | */ | |
617ba13b MC |
179 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
180 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
181 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
182 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
183 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
184 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 185 | |
617ba13b MC |
186 | /* First non-reserved inode for old ext4 filesystems */ |
187 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
188 | |
189 | /* | |
190 | * Maximal count of links to a file | |
191 | */ | |
f8628a14 | 192 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
193 | |
194 | /* | |
195 | * Macro-instructions used to manage several block sizes | |
196 | */ | |
617ba13b | 197 | #define EXT4_MIN_BLOCK_SIZE 1024 |
afc7cbca TS |
198 | #define EXT4_MAX_BLOCK_SIZE 65536 |
199 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
ac27a0ec | 200 | #ifdef __KERNEL__ |
617ba13b | 201 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 202 | #else |
617ba13b | 203 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 204 | #endif |
af5bc92d | 205 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
ac27a0ec | 206 | #ifdef __KERNEL__ |
617ba13b | 207 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
ac27a0ec | 208 | #else |
617ba13b | 209 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
210 | #endif |
211 | #ifdef __KERNEL__ | |
617ba13b MC |
212 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
213 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
214 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 215 | #else |
617ba13b MC |
216 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
217 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 218 | (s)->s_inode_size) |
617ba13b MC |
219 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
220 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
221 | (s)->s_first_ino) |
222 | #endif | |
a2df2a63 | 223 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 224 | |
ac27a0ec DK |
225 | /* |
226 | * Structure of a blocks group descriptor | |
227 | */ | |
617ba13b | 228 | struct ext4_group_desc |
ac27a0ec | 229 | { |
3a14589c | 230 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
5272f837 AK |
231 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
232 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
560671a0 AK |
233 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
234 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
235 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
717d50e4 AD |
236 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
237 | __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ | |
560671a0 | 238 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
717d50e4 | 239 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8fadc143 AR |
240 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
241 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
242 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
91b51a01 CL |
243 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
244 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
245 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
560671a0 | 246 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
91b51a01 | 247 | __u32 bg_reserved2[3]; |
ac27a0ec DK |
248 | }; |
249 | ||
772cb7c8 JS |
250 | /* |
251 | * Structure of a flex block group info | |
252 | */ | |
253 | ||
254 | struct flex_groups { | |
9f24e420 TT |
255 | atomic_t free_inodes; |
256 | atomic_t free_blocks; | |
7d39db14 | 257 | atomic_t used_dirs; |
772cb7c8 JS |
258 | }; |
259 | ||
717d50e4 AD |
260 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
261 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
262 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
263 | ||
ac27a0ec DK |
264 | /* |
265 | * Macro-instructions used to manage group descriptors | |
266 | */ | |
0d1ee42f | 267 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 268 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
269 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
270 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 271 | #ifdef __KERNEL__ |
617ba13b MC |
272 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
273 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | |
274 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
275 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 276 | #else |
617ba13b | 277 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 278 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 279 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
280 | #endif |
281 | ||
282 | /* | |
283 | * Constants relative to the data blocks | |
284 | */ | |
617ba13b MC |
285 | #define EXT4_NDIR_BLOCKS 12 |
286 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
287 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
288 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
289 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
290 | |
291 | /* | |
292 | * Inode flags | |
293 | */ | |
617ba13b MC |
294 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
295 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
296 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
297 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
298 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
299 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
300 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
301 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 302 | /* Reserved for compression usage... */ |
617ba13b MC |
303 | #define EXT4_DIRTY_FL 0x00000100 |
304 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
305 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
306 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
ac27a0ec | 307 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
308 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
309 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
310 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
311 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
312 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
313 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
8180a562 | 314 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
a86c6181 | 315 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
f710b4b9 | 316 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
c8d46e41 | 317 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
8180a562 | 318 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
ac27a0ec | 319 | |
c8d46e41 JZ |
320 | #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ |
321 | #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ | |
ac27a0ec | 322 | |
8fa43a81 DG |
323 | /* Flags that should be inherited by new inodes from their parent. */ |
324 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
325 | EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ | |
326 | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ | |
327 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ | |
328 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) | |
329 | ||
2dc6b0d4 DG |
330 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
331 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
332 | ||
333 | /* Flags that are appropriate for non-directories/regular files. */ | |
334 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
335 | ||
336 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
337 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
338 | { | |
339 | if (S_ISDIR(mode)) | |
340 | return flags; | |
341 | else if (S_ISREG(mode)) | |
342 | return flags & EXT4_REG_FLMASK; | |
343 | else | |
344 | return flags & EXT4_OTHER_FLMASK; | |
345 | } | |
346 | ||
12e9b892 DM |
347 | /* |
348 | * Inode flags used for atomic set/get | |
349 | */ | |
350 | enum { | |
351 | EXT4_INODE_SECRM = 0, /* Secure deletion */ | |
352 | EXT4_INODE_UNRM = 1, /* Undelete */ | |
353 | EXT4_INODE_COMPR = 2, /* Compress file */ | |
354 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ | |
355 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ | |
356 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ | |
357 | EXT4_INODE_NODUMP = 6, /* do not dump file */ | |
358 | EXT4_INODE_NOATIME = 7, /* do not update atime */ | |
359 | /* Reserved for compression usage... */ | |
360 | EXT4_INODE_DIRTY = 8, | |
361 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ | |
362 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ | |
363 | EXT4_INODE_ECOMPR = 11, /* Compression error */ | |
364 | /* End compression flags --- maybe not all used */ | |
365 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ | |
366 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ | |
367 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ | |
368 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ | |
369 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ | |
370 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ | |
371 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ | |
372 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ | |
373 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ | |
374 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ | |
375 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ | |
376 | }; | |
377 | ||
378 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) | |
379 | #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ | |
380 | printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ | |
381 | EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } | |
382 | ||
383 | /* | |
384 | * Since it's pretty easy to mix up bit numbers and hex values, and we | |
385 | * can't do a compile-time test for ENUM values, we use a run-time | |
386 | * test to make sure that EXT4_XXX_FL is consistent with respect to | |
387 | * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop | |
388 | * out so it won't cost any extra space in the compiled kernel image. | |
389 | * But it's important that these values are the same, since we are | |
390 | * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL | |
391 | * must be consistent with the values of FS_XXX_FL defined in | |
392 | * include/linux/fs.h and the on-disk values found in ext2, ext3, and | |
393 | * ext4 filesystems, and of course the values defined in e2fsprogs. | |
394 | * | |
395 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) | |
396 | */ | |
397 | static inline void ext4_check_flag_values(void) | |
398 | { | |
399 | CHECK_FLAG_VALUE(SECRM); | |
400 | CHECK_FLAG_VALUE(UNRM); | |
401 | CHECK_FLAG_VALUE(COMPR); | |
402 | CHECK_FLAG_VALUE(SYNC); | |
403 | CHECK_FLAG_VALUE(IMMUTABLE); | |
404 | CHECK_FLAG_VALUE(APPEND); | |
405 | CHECK_FLAG_VALUE(NODUMP); | |
406 | CHECK_FLAG_VALUE(NOATIME); | |
407 | CHECK_FLAG_VALUE(DIRTY); | |
408 | CHECK_FLAG_VALUE(COMPRBLK); | |
409 | CHECK_FLAG_VALUE(NOCOMPR); | |
410 | CHECK_FLAG_VALUE(ECOMPR); | |
411 | CHECK_FLAG_VALUE(INDEX); | |
412 | CHECK_FLAG_VALUE(IMAGIC); | |
413 | CHECK_FLAG_VALUE(JOURNAL_DATA); | |
414 | CHECK_FLAG_VALUE(NOTAIL); | |
415 | CHECK_FLAG_VALUE(DIRSYNC); | |
416 | CHECK_FLAG_VALUE(TOPDIR); | |
417 | CHECK_FLAG_VALUE(HUGE_FILE); | |
418 | CHECK_FLAG_VALUE(EXTENTS); | |
419 | CHECK_FLAG_VALUE(EA_INODE); | |
420 | CHECK_FLAG_VALUE(EOFBLOCKS); | |
421 | CHECK_FLAG_VALUE(RESERVED); | |
422 | } | |
423 | ||
ac27a0ec | 424 | /* Used to pass group descriptor data when online resize is done */ |
617ba13b | 425 | struct ext4_new_group_input { |
8c55e204 DK |
426 | __u32 group; /* Group number for this data */ |
427 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
428 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
429 | __u64 inode_table; /* Absolute block number of inode table start */ | |
430 | __u32 blocks_count; /* Total number of blocks in this group */ | |
431 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
432 | __u16 unused; |
433 | }; | |
434 | ||
617ba13b MC |
435 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
436 | struct ext4_new_group_data { | |
ac27a0ec | 437 | __u32 group; |
bd81d8ee LV |
438 | __u64 block_bitmap; |
439 | __u64 inode_bitmap; | |
440 | __u64 inode_table; | |
ac27a0ec DK |
441 | __u32 blocks_count; |
442 | __u16 reserved_blocks; | |
443 | __u16 unused; | |
444 | __u32 free_blocks_count; | |
445 | }; | |
446 | ||
a2df2a63 | 447 | /* |
c2177057 | 448 | * Flags used by ext4_get_blocks() |
a2df2a63 | 449 | */ |
c2177057 TT |
450 | /* Allocate any needed blocks and/or convert an unitialized |
451 | extent to be an initialized ext4 */ | |
2ac3b6e0 | 452 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
c2177057 | 453 | /* Request the creation of an unitialized extent */ |
2ac3b6e0 | 454 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 |
c2177057 TT |
455 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ |
456 | EXT4_GET_BLOCKS_CREATE) | |
c2177057 | 457 | /* Caller is from the delayed allocation writeout path, |
2ac3b6e0 TT |
458 | so set the magic i_delalloc_reserve_flag after taking the |
459 | inode allocation semaphore for */ | |
03f5d8bc | 460 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
0031462b MC |
461 | /* caller is from the direct IO path, request to creation of an |
462 | unitialized extents if not allocated, split the uninitialized | |
463 | extent if blocks has been preallocated already*/ | |
c7064ef1 | 464 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
1296cc85 | 465 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
c7064ef1 | 466 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
0031462b | 467 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
c7064ef1 JZ |
468 | /* Convert extent to initialized after IO complete */ |
469 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ | |
0031462b | 470 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
ac27a0ec | 471 | |
e6362609 TT |
472 | /* |
473 | * Flags used by ext4_free_blocks | |
474 | */ | |
475 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 | |
476 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 | |
1f2acb60 | 477 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
e6362609 | 478 | |
ac27a0ec DK |
479 | /* |
480 | * ioctl commands | |
481 | */ | |
617ba13b MC |
482 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
483 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
484 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
485 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
617ba13b MC |
486 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
487 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
e23291b9 | 488 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 489 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) |
ac27a0ec | 490 | #endif |
617ba13b MC |
491 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
492 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
8eea80d5 TT |
493 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
494 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
495 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
ccd2506b | 496 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
8eea80d5 | 497 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
ccd2506b | 498 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
748de673 | 499 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
ac27a0ec DK |
500 | |
501 | /* | |
502 | * ioctl commands in 32 bit emulation | |
503 | */ | |
617ba13b MC |
504 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
505 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
506 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
507 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
508 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
509 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
510 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
e23291b9 | 511 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 512 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) |
ac27a0ec | 513 | #endif |
617ba13b MC |
514 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
515 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
ac27a0ec DK |
516 | |
517 | ||
518 | /* | |
519 | * Mount options | |
520 | */ | |
617ba13b | 521 | struct ext4_mount_options { |
ac27a0ec DK |
522 | unsigned long s_mount_opt; |
523 | uid_t s_resuid; | |
524 | gid_t s_resgid; | |
525 | unsigned long s_commit_interval; | |
30773840 | 526 | u32 s_min_batch_time, s_max_batch_time; |
ac27a0ec DK |
527 | #ifdef CONFIG_QUOTA |
528 | int s_jquota_fmt; | |
529 | char *s_qf_names[MAXQUOTAS]; | |
530 | #endif | |
531 | }; | |
532 | ||
fb0a387d ES |
533 | /* Max physical block we can addres w/o extents */ |
534 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF | |
535 | ||
ac27a0ec DK |
536 | /* |
537 | * Structure of an inode on the disk | |
538 | */ | |
617ba13b | 539 | struct ext4_inode { |
ac27a0ec DK |
540 | __le16 i_mode; /* File mode */ |
541 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
a48380f7 | 542 | __le32 i_size_lo; /* Size in bytes */ |
ac27a0ec | 543 | __le32 i_atime; /* Access time */ |
ef7f3835 | 544 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
545 | __le32 i_mtime; /* Modification time */ |
546 | __le32 i_dtime; /* Deletion Time */ | |
547 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
548 | __le16 i_links_count; /* Links count */ | |
0fc1b451 | 549 | __le32 i_blocks_lo; /* Blocks count */ |
ac27a0ec DK |
550 | __le32 i_flags; /* File flags */ |
551 | union { | |
552 | struct { | |
25ec56b5 | 553 | __le32 l_i_version; |
ac27a0ec DK |
554 | } linux1; |
555 | struct { | |
556 | __u32 h_i_translator; | |
557 | } hurd1; | |
558 | struct { | |
559 | __u32 m_i_reserved1; | |
560 | } masix1; | |
561 | } osd1; /* OS dependent 1 */ | |
617ba13b | 562 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec | 563 | __le32 i_generation; /* File version (for NFS) */ |
7973c0c1 | 564 | __le32 i_file_acl_lo; /* File ACL */ |
a48380f7 | 565 | __le32 i_size_high; |
f077d0d7 | 566 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
567 | union { |
568 | struct { | |
0fc1b451 | 569 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
a1ddeb7e | 570 | __le16 l_i_file_acl_high; |
8c55e204 | 571 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec DK |
572 | __le16 l_i_gid_high; /* were reserved2[0] */ |
573 | __u32 l_i_reserved2; | |
574 | } linux2; | |
575 | struct { | |
f077d0d7 | 576 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
577 | __u16 h_i_mode_high; |
578 | __u16 h_i_uid_high; | |
579 | __u16 h_i_gid_high; | |
580 | __u32 h_i_author; | |
581 | } hurd2; | |
582 | struct { | |
f077d0d7 | 583 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 584 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
585 | __u32 m_i_reserved2[2]; |
586 | } masix2; | |
587 | } osd2; /* OS dependent 2 */ | |
588 | __le16 i_extra_isize; | |
589 | __le16 i_pad1; | |
ef7f3835 KS |
590 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
591 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
592 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
593 | __le32 i_crtime; /* File Creation time */ | |
594 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
25ec56b5 | 595 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
ac27a0ec DK |
596 | }; |
597 | ||
748de673 AF |
598 | struct move_extent { |
599 | __u32 reserved; /* should be zero */ | |
600 | __u32 donor_fd; /* donor file descriptor */ | |
601 | __u64 orig_start; /* logical start offset in block for orig */ | |
602 | __u64 donor_start; /* logical start offset in block for donor */ | |
603 | __u64 len; /* block length to be moved */ | |
604 | __u64 moved_len; /* moved block length */ | |
605 | }; | |
ac27a0ec | 606 | |
ef7f3835 KS |
607 | #define EXT4_EPOCH_BITS 2 |
608 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
609 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
610 | ||
611 | /* | |
612 | * Extended fields will fit into an inode if the filesystem was formatted | |
613 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
614 | * consuming all of the available space. For new inodes we always reserve | |
615 | * enough space for the kernel's known extended fields, but for inodes | |
616 | * created with an old kernel this might not have been the case. None of | |
617 | * the extended inode fields is critical for correct filesystem operation. | |
618 | * This macro checks if a certain field fits in the inode. Note that | |
619 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
620 | */ | |
621 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
622 | ((offsetof(typeof(*ext4_inode), field) + \ | |
623 | sizeof((ext4_inode)->field)) \ | |
624 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
625 | (einode)->i_extra_isize)) \ | |
626 | ||
627 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
628 | { | |
629 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
c1fccc06 TT |
630 | (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | |
631 | ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); | |
ef7f3835 KS |
632 | } |
633 | ||
634 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
635 | { | |
636 | if (sizeof(time->tv_sec) > 4) | |
637 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
638 | << 32; | |
c1fccc06 | 639 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; |
ef7f3835 KS |
640 | } |
641 | ||
642 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
643 | do { \ | |
644 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
645 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
646 | (raw_inode)->xtime ## _extra = \ | |
647 | ext4_encode_extra_time(&(inode)->xtime); \ | |
648 | } while (0) | |
649 | ||
650 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
651 | do { \ | |
652 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
653 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
654 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
655 | (raw_inode)->xtime ## _extra = \ | |
656 | ext4_encode_extra_time(&(einode)->xtime); \ | |
657 | } while (0) | |
658 | ||
659 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
660 | do { \ | |
661 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
662 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
663 | ext4_decode_extra_time(&(inode)->xtime, \ | |
664 | raw_inode->xtime ## _extra); \ | |
665 | } while (0) | |
666 | ||
667 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
668 | do { \ | |
669 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
670 | (einode)->xtime.tv_sec = \ | |
671 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
672 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
673 | ext4_decode_extra_time(&(einode)->xtime, \ | |
674 | raw_inode->xtime ## _extra); \ | |
675 | } while (0) | |
676 | ||
25ec56b5 JNC |
677 | #define i_disk_version osd1.linux1.l_i_version |
678 | ||
ac27a0ec DK |
679 | #if defined(__KERNEL__) || defined(__linux__) |
680 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 681 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
0fc1b451 | 682 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
ac27a0ec DK |
683 | #define i_uid_low i_uid |
684 | #define i_gid_low i_gid | |
685 | #define i_uid_high osd2.linux2.l_i_uid_high | |
686 | #define i_gid_high osd2.linux2.l_i_gid_high | |
687 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
688 | ||
689 | #elif defined(__GNU__) | |
690 | ||
691 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
692 | #define i_uid_high osd2.hurd2.h_i_uid_high |
693 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
694 | #define i_author osd2.hurd2.h_i_author | |
695 | ||
696 | #elif defined(__masix__) | |
697 | ||
698 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 699 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
700 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
701 | ||
702 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
703 | ||
d444c3c3 TT |
704 | /* |
705 | * storage for cached extent | |
706 | */ | |
707 | struct ext4_ext_cache { | |
708 | ext4_fsblk_t ec_start; | |
709 | ext4_lblk_t ec_block; | |
710 | __u32 ec_len; /* must be 32bit to return holes */ | |
711 | __u32 ec_type; | |
712 | }; | |
713 | ||
714 | /* | |
715 | * fourth extended file system inode data in memory | |
716 | */ | |
717 | struct ext4_inode_info { | |
718 | __le32 i_data[15]; /* unconverted */ | |
d444c3c3 | 719 | __u32 i_dtime; |
12e9b892 | 720 | ext4_fsblk_t i_file_acl; |
d444c3c3 TT |
721 | |
722 | /* | |
723 | * i_block_group is the number of the block group which contains | |
724 | * this file's inode. Constant across the lifetime of the inode, | |
725 | * it is ued for making block allocation decisions - we try to | |
726 | * place a file's data blocks near its inode block, and new inodes | |
727 | * near to their parent directory's inode. | |
728 | */ | |
729 | ext4_group_t i_block_group; | |
19f5fb7a | 730 | unsigned long i_state_flags; /* Dynamic state flags */ |
12e9b892 | 731 | unsigned long i_flags; |
d444c3c3 TT |
732 | |
733 | ext4_lblk_t i_dir_start_lookup; | |
734 | #ifdef CONFIG_EXT4_FS_XATTR | |
735 | /* | |
736 | * Extended attributes can be read independently of the main file | |
737 | * data. Taking i_mutex even when reading would cause contention | |
738 | * between readers of EAs and writers of regular file data, so | |
739 | * instead we synchronize on xattr_sem when reading or changing | |
740 | * EAs. | |
741 | */ | |
742 | struct rw_semaphore xattr_sem; | |
743 | #endif | |
d444c3c3 TT |
744 | |
745 | struct list_head i_orphan; /* unlinked but open inodes */ | |
746 | ||
747 | /* | |
748 | * i_disksize keeps track of what the inode size is ON DISK, not | |
749 | * in memory. During truncate, i_size is set to the new size by | |
750 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
751 | * set i_disksize to 0 until the truncate is actually under way. | |
752 | * | |
753 | * The intent is that i_disksize always represents the blocks which | |
754 | * are used by this file. This allows recovery to restart truncate | |
755 | * on orphans if we crash during truncate. We actually write i_disksize | |
756 | * into the on-disk inode when writing inodes out, instead of i_size. | |
757 | * | |
758 | * The only time when i_disksize and i_size may be different is when | |
759 | * a truncate is in progress. The only things which change i_disksize | |
760 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
761 | */ | |
762 | loff_t i_disksize; | |
763 | ||
764 | /* | |
765 | * i_data_sem is for serialising ext4_truncate() against | |
766 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
767 | * data tree are chopped off during truncate. We can't do that in | |
768 | * ext4 because whenever we perform intermediate commits during | |
769 | * truncate, the inode and all the metadata blocks *must* be in a | |
770 | * consistent state which allows truncation of the orphans to restart | |
771 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
772 | * by other means, so we have i_data_sem. | |
773 | */ | |
774 | struct rw_semaphore i_data_sem; | |
775 | struct inode vfs_inode; | |
776 | struct jbd2_inode jinode; | |
777 | ||
778 | struct ext4_ext_cache i_cached_extent; | |
779 | /* | |
780 | * File creation time. Its function is same as that of | |
781 | * struct timespec i_{a,c,m}time in the generic inode. | |
782 | */ | |
783 | struct timespec i_crtime; | |
784 | ||
785 | /* mballoc */ | |
786 | struct list_head i_prealloc_list; | |
787 | spinlock_t i_prealloc_lock; | |
788 | ||
789 | /* ialloc */ | |
790 | ext4_group_t i_last_alloc_group; | |
791 | ||
792 | /* allocation reservation info for delalloc */ | |
793 | unsigned int i_reserved_data_blocks; | |
794 | unsigned int i_reserved_meta_blocks; | |
795 | unsigned int i_allocated_meta_blocks; | |
796 | unsigned short i_delalloc_reserved_flag; | |
9d0be502 TT |
797 | sector_t i_da_metadata_calc_last_lblock; |
798 | int i_da_metadata_calc_len; | |
d444c3c3 TT |
799 | |
800 | /* on-disk additional length */ | |
801 | __u16 i_extra_isize; | |
802 | ||
803 | spinlock_t i_block_reservation_lock; | |
a9e7f447 DM |
804 | #ifdef CONFIG_QUOTA |
805 | /* quota space reservation, managed internally by quota code */ | |
806 | qsize_t i_reserved_quota; | |
807 | #endif | |
8d5d02e6 | 808 | |
c7064ef1 JZ |
809 | /* completed IOs that might need unwritten extents handling */ |
810 | struct list_head i_completed_io_list; | |
744692dc | 811 | spinlock_t i_completed_io_lock; |
8d5d02e6 MC |
812 | /* current io_end structure for async DIO write*/ |
813 | ext4_io_end_t *cur_aio_dio; | |
b436b9be JK |
814 | |
815 | /* | |
816 | * Transactions that contain inode's metadata needed to complete | |
817 | * fsync and fdatasync, respectively. | |
818 | */ | |
819 | tid_t i_sync_tid; | |
820 | tid_t i_datasync_tid; | |
d444c3c3 TT |
821 | }; |
822 | ||
ac27a0ec DK |
823 | /* |
824 | * File system states | |
825 | */ | |
617ba13b MC |
826 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
827 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
828 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec | 829 | |
469108ff TT |
830 | /* |
831 | * Misc. filesystem flags | |
832 | */ | |
833 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
834 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
835 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
836 | ||
ac27a0ec DK |
837 | /* |
838 | * Mount flags | |
839 | */ | |
617ba13b MC |
840 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ |
841 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
842 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
843 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
844 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
845 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
846 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
847 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
617ba13b MC |
848 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
849 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
850 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
851 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
852 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
853 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
854 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
855 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
afd4672d | 856 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
617ba13b MC |
857 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
858 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | |
859 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
860 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
861 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
744692dc | 862 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
d4da6c9c | 863 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
818d276c | 864 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
25ec56b5 | 865 | #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ |
64769240 | 866 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
5bf5683a | 867 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
6fd058f7 | 868 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
5328e635 | 869 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
5bf5683a | 870 | |
617ba13b MC |
871 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
872 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | |
873 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
874 | EXT4_MOUNT_##opt) | |
ac27a0ec | 875 | |
617ba13b MC |
876 | #define ext4_set_bit ext2_set_bit |
877 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
878 | #define ext4_clear_bit ext2_clear_bit | |
879 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
880 | #define ext4_test_bit ext2_test_bit | |
881 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | |
882 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | |
aa02ad67 | 883 | #define ext4_find_next_bit ext2_find_next_bit |
ac27a0ec DK |
884 | |
885 | /* | |
886 | * Maximal mount counts between two filesystem checks | |
887 | */ | |
617ba13b MC |
888 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
889 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
890 | |
891 | /* | |
892 | * Behaviour when detecting errors | |
893 | */ | |
617ba13b MC |
894 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
895 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
896 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
897 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec DK |
898 | |
899 | /* | |
900 | * Structure of the super block | |
901 | */ | |
617ba13b | 902 | struct ext4_super_block { |
ac27a0ec | 903 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 904 | __le32 s_blocks_count_lo; /* Blocks count */ |
308ba3ec AK |
905 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
906 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
ac27a0ec DK |
907 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
908 | __le32 s_first_data_block; /* First Data Block */ | |
909 | __le32 s_log_block_size; /* Block size */ | |
f077d0d7 | 910 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ |
ac27a0ec | 911 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
f077d0d7 | 912 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ |
ac27a0ec DK |
913 | __le32 s_inodes_per_group; /* # Inodes per group */ |
914 | __le32 s_mtime; /* Mount time */ | |
915 | /*30*/ __le32 s_wtime; /* Write time */ | |
916 | __le16 s_mnt_count; /* Mount count */ | |
917 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
918 | __le16 s_magic; /* Magic signature */ | |
919 | __le16 s_state; /* File system state */ | |
920 | __le16 s_errors; /* Behaviour when detecting errors */ | |
921 | __le16 s_minor_rev_level; /* minor revision level */ | |
922 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
923 | __le32 s_checkinterval; /* max. time between checks */ | |
924 | __le32 s_creator_os; /* OS */ | |
925 | __le32 s_rev_level; /* Revision level */ | |
926 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
927 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
928 | /* | |
617ba13b | 929 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
930 | * |
931 | * Note: the difference between the compatible feature set and | |
932 | * the incompatible feature set is that if there is a bit set | |
933 | * in the incompatible feature set that the kernel doesn't | |
934 | * know about, it should refuse to mount the filesystem. | |
935 | * | |
936 | * e2fsck's requirements are more strict; if it doesn't know | |
937 | * about a feature in either the compatible or incompatible | |
938 | * feature set, it must abort and not try to meddle with | |
939 | * things it doesn't understand... | |
940 | */ | |
941 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 942 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
943 | __le16 s_block_group_nr; /* block group # of this superblock */ |
944 | __le32 s_feature_compat; /* compatible feature set */ | |
945 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
946 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
947 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
948 | /*78*/ char s_volume_name[16]; /* volume name */ | |
949 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
950 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
951 | /* | |
952 | * Performance hints. Directory preallocation should only | |
617ba13b | 953 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
954 | */ |
955 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
956 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
957 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
958 | /* | |
617ba13b | 959 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
960 | */ |
961 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
962 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
963 | __le32 s_journal_dev; /* device number of journal file */ | |
964 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
965 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
966 | __u8 s_def_hash_version; /* Default hash version to use */ | |
967 | __u8 s_reserved_char_pad; | |
0d1ee42f | 968 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 969 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 970 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
971 | __le32 s_mkfs_time; /* When the filesystem was created */ |
972 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
973 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
974 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
975 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
976 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
977 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
978 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
979 | __le32 s_flags; /* Miscellaneous flags */ | |
980 | __le16 s_raid_stride; /* RAID stride */ | |
981 | __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ | |
982 | __le64 s_mmp_block; /* Block for multi-mount protection */ | |
983 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
772cb7c8 JS |
984 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
985 | __u8 s_reserved_char_pad2; | |
986 | __le16 s_reserved_pad; | |
afc32f7e TT |
987 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
988 | __u32 s_reserved[160]; /* Padding to the end of the block */ | |
ac27a0ec DK |
989 | }; |
990 | ||
991 | #ifdef __KERNEL__ | |
bc0b0d6d TT |
992 | |
993 | /* | |
4ab2f15b | 994 | * run-time mount flags |
bc0b0d6d TT |
995 | */ |
996 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 | |
4ab2f15b | 997 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
bc0b0d6d | 998 | |
ca0faba0 TT |
999 | /* |
1000 | * fourth extended-fs super-block data in memory | |
1001 | */ | |
1002 | struct ext4_sb_info { | |
1003 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
1004 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
1005 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
1006 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ | |
1007 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
1008 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
1009 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
1010 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
fb0a387d | 1011 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
ca0faba0 TT |
1012 | unsigned long s_overhead_last; /* Last calculated overhead */ |
1013 | unsigned long s_blocks_last; /* Last seen block count */ | |
1014 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ | |
1015 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
1016 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
1017 | struct buffer_head **s_group_desc; | |
7f4520cc | 1018 | unsigned int s_mount_opt; |
bc0b0d6d | 1019 | unsigned int s_mount_flags; |
ca0faba0 TT |
1020 | ext4_fsblk_t s_sb_block; |
1021 | uid_t s_resuid; | |
1022 | gid_t s_resgid; | |
1023 | unsigned short s_mount_state; | |
1024 | unsigned short s_pad; | |
1025 | int s_addr_per_block_bits; | |
1026 | int s_desc_per_block_bits; | |
1027 | int s_inode_size; | |
1028 | int s_first_ino; | |
1029 | unsigned int s_inode_readahead_blks; | |
11013911 | 1030 | unsigned int s_inode_goal; |
ca0faba0 TT |
1031 | spinlock_t s_next_gen_lock; |
1032 | u32 s_next_generation; | |
1033 | u32 s_hash_seed[4]; | |
1034 | int s_def_hash_version; | |
1035 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
1036 | struct percpu_counter s_freeblocks_counter; | |
1037 | struct percpu_counter s_freeinodes_counter; | |
1038 | struct percpu_counter s_dirs_counter; | |
1039 | struct percpu_counter s_dirtyblocks_counter; | |
1040 | struct blockgroup_lock *s_blockgroup_lock; | |
1041 | struct proc_dir_entry *s_proc; | |
1042 | struct kobject s_kobj; | |
1043 | struct completion s_kobj_unregister; | |
1044 | ||
1045 | /* Journaling */ | |
1046 | struct inode *s_journal_inode; | |
1047 | struct journal_s *s_journal; | |
1048 | struct list_head s_orphan; | |
1049 | struct mutex s_orphan_lock; | |
1050 | struct mutex s_resize_lock; | |
1051 | unsigned long s_commit_interval; | |
1052 | u32 s_max_batch_time; | |
1053 | u32 s_min_batch_time; | |
1054 | struct block_device *journal_bdev; | |
1055 | #ifdef CONFIG_JBD2_DEBUG | |
1056 | struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ | |
1057 | wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ | |
1058 | #endif | |
1059 | #ifdef CONFIG_QUOTA | |
1060 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ | |
1061 | int s_jquota_fmt; /* Format of quota to use */ | |
1062 | #endif | |
1063 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
6fd058f7 | 1064 | struct rb_root system_blks; |
ca0faba0 TT |
1065 | |
1066 | #ifdef EXTENTS_STATS | |
1067 | /* ext4 extents stats */ | |
1068 | unsigned long s_ext_min; | |
1069 | unsigned long s_ext_max; | |
1070 | unsigned long s_depth_max; | |
1071 | spinlock_t s_ext_stats_lock; | |
1072 | unsigned long s_ext_blocks; | |
1073 | unsigned long s_ext_extents; | |
1074 | #endif | |
1075 | ||
1076 | /* for buddy allocator */ | |
1077 | struct ext4_group_info ***s_group_info; | |
1078 | struct inode *s_buddy_cache; | |
1079 | long s_blocks_reserved; | |
1080 | spinlock_t s_reserve_lock; | |
1081 | spinlock_t s_md_lock; | |
1082 | tid_t s_last_transaction; | |
1083 | unsigned short *s_mb_offsets; | |
1084 | unsigned int *s_mb_maxs; | |
1085 | ||
1086 | /* tunables */ | |
1087 | unsigned long s_stripe; | |
1088 | unsigned int s_mb_stream_request; | |
1089 | unsigned int s_mb_max_to_scan; | |
1090 | unsigned int s_mb_min_to_scan; | |
1091 | unsigned int s_mb_stats; | |
1092 | unsigned int s_mb_order2_reqs; | |
1093 | unsigned int s_mb_group_prealloc; | |
55138e0b | 1094 | unsigned int s_max_writeback_mb_bump; |
ca0faba0 TT |
1095 | /* where last allocation was done - for stream allocation */ |
1096 | unsigned long s_mb_last_group; | |
1097 | unsigned long s_mb_last_start; | |
1098 | ||
ca0faba0 TT |
1099 | /* stats for buddy allocator */ |
1100 | spinlock_t s_mb_pa_lock; | |
1101 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ | |
1102 | atomic_t s_bal_success; /* we found long enough chunks */ | |
1103 | atomic_t s_bal_allocated; /* in blocks */ | |
1104 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
1105 | atomic_t s_bal_goals; /* goal hits */ | |
1106 | atomic_t s_bal_breaks; /* too long searches */ | |
1107 | atomic_t s_bal_2orders; /* 2^order hits */ | |
1108 | spinlock_t s_bal_lock; | |
1109 | unsigned long s_mb_buddies_generated; | |
1110 | unsigned long long s_mb_generation_time; | |
1111 | atomic_t s_mb_lost_chunks; | |
1112 | atomic_t s_mb_preallocated; | |
1113 | atomic_t s_mb_discarded; | |
50797481 | 1114 | atomic_t s_lock_busy; |
ca0faba0 TT |
1115 | |
1116 | /* locality groups */ | |
003cb608 | 1117 | struct ext4_locality_group __percpu *s_locality_groups; |
ca0faba0 TT |
1118 | |
1119 | /* for write statistics */ | |
1120 | unsigned long s_sectors_written_start; | |
1121 | u64 s_kbytes_written; | |
1122 | ||
1123 | unsigned int s_log_groups_per_flex; | |
1124 | struct flex_groups *s_flex_groups; | |
4c0425ff MC |
1125 | |
1126 | /* workqueue for dio unwritten */ | |
1127 | struct workqueue_struct *dio_unwritten_wq; | |
ca0faba0 TT |
1128 | }; |
1129 | ||
af5bc92d | 1130 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
1131 | { |
1132 | return sb->s_fs_info; | |
1133 | } | |
617ba13b | 1134 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 1135 | { |
617ba13b | 1136 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
1137 | } |
1138 | ||
ef7f3835 KS |
1139 | static inline struct timespec ext4_current_time(struct inode *inode) |
1140 | { | |
1141 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
1142 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
1143 | } | |
1144 | ||
617ba13b | 1145 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 1146 | { |
617ba13b MC |
1147 | return ino == EXT4_ROOT_INO || |
1148 | ino == EXT4_JOURNAL_INO || | |
1149 | ino == EXT4_RESIZE_INO || | |
1150 | (ino >= EXT4_FIRST_INO(sb) && | |
1151 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec | 1152 | } |
19f5fb7a TT |
1153 | |
1154 | /* | |
1155 | * Inode dynamic state flags | |
1156 | */ | |
1157 | enum { | |
1158 | EXT4_STATE_JDATA, /* journaled data exists */ | |
1159 | EXT4_STATE_NEW, /* inode is newly created */ | |
1160 | EXT4_STATE_XATTR, /* has in-inode xattrs */ | |
1161 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ | |
1162 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ | |
1163 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ | |
1164 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ | |
1165 | }; | |
1166 | ||
12e9b892 DM |
1167 | #define EXT4_INODE_BIT_FNS(name, field) \ |
1168 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ | |
1169 | { \ | |
1170 | return test_bit(bit, &EXT4_I(inode)->i_##field); \ | |
1171 | } \ | |
1172 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ | |
1173 | { \ | |
1174 | set_bit(bit, &EXT4_I(inode)->i_##field); \ | |
1175 | } \ | |
1176 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ | |
1177 | { \ | |
1178 | clear_bit(bit, &EXT4_I(inode)->i_##field); \ | |
19f5fb7a TT |
1179 | } |
1180 | ||
12e9b892 DM |
1181 | EXT4_INODE_BIT_FNS(flag, flags) |
1182 | EXT4_INODE_BIT_FNS(state, state_flags) | |
ac27a0ec | 1183 | #else |
617ba13b | 1184 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
1185 | * a kernel struct super_block. This will allow us to call the feature-test |
1186 | * macros from user land. */ | |
617ba13b | 1187 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
1188 | #endif |
1189 | ||
617ba13b | 1190 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
1191 | |
1192 | /* | |
1193 | * Codes for operating systems | |
1194 | */ | |
617ba13b MC |
1195 | #define EXT4_OS_LINUX 0 |
1196 | #define EXT4_OS_HURD 1 | |
1197 | #define EXT4_OS_MASIX 2 | |
1198 | #define EXT4_OS_FREEBSD 3 | |
1199 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
1200 | |
1201 | /* | |
1202 | * Revision levels | |
1203 | */ | |
617ba13b MC |
1204 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1205 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 1206 | |
617ba13b MC |
1207 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1208 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 1209 | |
617ba13b | 1210 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
1211 | |
1212 | /* | |
1213 | * Feature set definitions | |
1214 | */ | |
1215 | ||
617ba13b | 1216 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1217 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1218 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1219 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1220 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1221 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
617ba13b MC |
1222 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
1223 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1224 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1225 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1226 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1227 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1228 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1229 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1230 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1231 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1232 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1233 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1234 | ||
1235 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1236 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1237 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1238 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1239 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1240 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1241 | ||
1242 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1243 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1244 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
0fc1b451 | 1245 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
717d50e4 | 1246 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 1247 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 1248 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
617ba13b MC |
1249 | |
1250 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1251 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1252 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1253 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1254 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 1255 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 1256 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
0fc1b451 | 1257 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
ce421581 | 1258 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
f710b4b9 TT |
1259 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
1260 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ | |
617ba13b MC |
1261 | |
1262 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
1263 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1264 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 1265 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 1266 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 JS |
1267 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
1268 | EXT4_FEATURE_INCOMPAT_FLEX_BG) | |
617ba13b MC |
1269 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1270 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 1271 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 1272 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 1273 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
0fc1b451 AK |
1274 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
1275 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE) | |
ac27a0ec DK |
1276 | |
1277 | /* | |
1278 | * Default values for user and/or group using reserved blocks | |
1279 | */ | |
617ba13b MC |
1280 | #define EXT4_DEF_RESUID 0 |
1281 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec | 1282 | |
240799cd TT |
1283 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1284 | ||
ac27a0ec DK |
1285 | /* |
1286 | * Default mount options | |
1287 | */ | |
617ba13b MC |
1288 | #define EXT4_DEFM_DEBUG 0x0001 |
1289 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1290 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1291 | #define EXT4_DEFM_ACL 0x0008 | |
1292 | #define EXT4_DEFM_UID16 0x0010 | |
1293 | #define EXT4_DEFM_JMODE 0x0060 | |
1294 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1295 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1296 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
ac27a0ec | 1297 | |
30773840 TT |
1298 | /* |
1299 | * Default journal batch times | |
1300 | */ | |
1301 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1302 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1303 | ||
a4912123 TT |
1304 | /* |
1305 | * Minimum number of groups in a flexgroup before we separate out | |
1306 | * directories into the first block group of a flexgroup | |
1307 | */ | |
1308 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1309 | ||
ac27a0ec DK |
1310 | /* |
1311 | * Structure of a directory entry | |
1312 | */ | |
617ba13b | 1313 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 1314 | |
617ba13b | 1315 | struct ext4_dir_entry { |
ac27a0ec DK |
1316 | __le32 inode; /* Inode number */ |
1317 | __le16 rec_len; /* Directory entry length */ | |
1318 | __le16 name_len; /* Name length */ | |
617ba13b | 1319 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1320 | }; |
1321 | ||
1322 | /* | |
617ba13b | 1323 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
1324 | * stored in intel byte order, and the name_len field could never be |
1325 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1326 | * file_type field. | |
1327 | */ | |
617ba13b | 1328 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
1329 | __le32 inode; /* Inode number */ |
1330 | __le16 rec_len; /* Directory entry length */ | |
1331 | __u8 name_len; /* Name length */ | |
1332 | __u8 file_type; | |
617ba13b | 1333 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1334 | }; |
1335 | ||
1336 | /* | |
617ba13b | 1337 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
1338 | * other bits are reserved for now. |
1339 | */ | |
617ba13b MC |
1340 | #define EXT4_FT_UNKNOWN 0 |
1341 | #define EXT4_FT_REG_FILE 1 | |
1342 | #define EXT4_FT_DIR 2 | |
1343 | #define EXT4_FT_CHRDEV 3 | |
1344 | #define EXT4_FT_BLKDEV 4 | |
1345 | #define EXT4_FT_FIFO 5 | |
1346 | #define EXT4_FT_SOCK 6 | |
1347 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 1348 | |
617ba13b | 1349 | #define EXT4_FT_MAX 8 |
ac27a0ec DK |
1350 | |
1351 | /* | |
617ba13b | 1352 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
1353 | * |
1354 | * NOTE: It must be a multiple of 4 | |
1355 | */ | |
617ba13b MC |
1356 | #define EXT4_DIR_PAD 4 |
1357 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1358 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1359 | ~EXT4_DIR_ROUND) | |
a72d7f83 JK |
1360 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1361 | ||
ac27a0ec DK |
1362 | /* |
1363 | * Hash Tree Directory indexing | |
1364 | * (c) Daniel Phillips, 2001 | |
1365 | */ | |
1366 | ||
4074fe37 ES |
1367 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
1368 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
12e9b892 | 1369 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
617ba13b MC |
1370 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) |
1371 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
1372 | |
1373 | /* Legal values for the dx_root hash_version field: */ | |
1374 | ||
1375 | #define DX_HASH_LEGACY 0 | |
1376 | #define DX_HASH_HALF_MD4 1 | |
1377 | #define DX_HASH_TEA 2 | |
f99b2589 TT |
1378 | #define DX_HASH_LEGACY_UNSIGNED 3 |
1379 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
1380 | #define DX_HASH_TEA_UNSIGNED 5 | |
ac27a0ec DK |
1381 | |
1382 | #ifdef __KERNEL__ | |
1383 | ||
1384 | /* hash info structure used by the directory hash */ | |
1385 | struct dx_hash_info | |
1386 | { | |
1387 | u32 hash; | |
1388 | u32 minor_hash; | |
1389 | int hash_version; | |
1390 | u32 *seed; | |
1391 | }; | |
1392 | ||
617ba13b | 1393 | #define EXT4_HTREE_EOF 0x7fffffff |
ac27a0ec DK |
1394 | |
1395 | /* | |
617ba13b | 1396 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
1397 | */ |
1398 | #define HASH_NB_ALWAYS 1 | |
1399 | ||
1400 | ||
1401 | /* | |
1402 | * Describe an inode's exact location on disk and in memory | |
1403 | */ | |
617ba13b | 1404 | struct ext4_iloc |
ac27a0ec DK |
1405 | { |
1406 | struct buffer_head *bh; | |
1407 | unsigned long offset; | |
fd2d4291 | 1408 | ext4_group_t block_group; |
ac27a0ec DK |
1409 | }; |
1410 | ||
617ba13b | 1411 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 1412 | { |
617ba13b | 1413 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
1414 | } |
1415 | ||
1416 | /* | |
1417 | * This structure is stuffed into the struct file's private_data field | |
1418 | * for directories. It is where we put information so that we can do | |
1419 | * readdir operations in hash tree order. | |
1420 | */ | |
1421 | struct dir_private_info { | |
1422 | struct rb_root root; | |
1423 | struct rb_node *curr_node; | |
1424 | struct fname *extra_fname; | |
1425 | loff_t last_pos; | |
1426 | __u32 curr_hash; | |
1427 | __u32 curr_minor_hash; | |
1428 | __u32 next_hash; | |
1429 | }; | |
1430 | ||
1431 | /* calculate the first block number of the group */ | |
617ba13b | 1432 | static inline ext4_fsblk_t |
fd2d4291 | 1433 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
ac27a0ec | 1434 | { |
617ba13b MC |
1435 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
1436 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
1437 | } |
1438 | ||
1439 | /* | |
1440 | * Special error return code only used by dx_probe() and its callers. | |
1441 | */ | |
1442 | #define ERR_BAD_DX_DIR -75000 | |
1443 | ||
72b64b59 | 1444 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
a9df9a49 | 1445 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); |
3a5b2ecd | 1446 | |
9f6200bb TT |
1447 | extern struct proc_dir_entry *ext4_proc_root; |
1448 | ||
ac27a0ec DK |
1449 | /* |
1450 | * Function prototypes | |
1451 | */ | |
1452 | ||
1453 | /* | |
1454 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 1455 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 1456 | */ |
8c55e204 DK |
1457 | # define NORET_TYPE /**/ |
1458 | # define ATTRIB_NORET __attribute__((noreturn)) | |
1459 | # define NORET_AND noreturn, | |
ac27a0ec | 1460 | |
498e5f24 TT |
1461 | /* bitmap.c */ |
1462 | extern unsigned int ext4_count_free(struct buffer_head *, unsigned); | |
1463 | ||
ac27a0ec | 1464 | /* balloc.c */ |
3a5b2ecd MC |
1465 | extern unsigned int ext4_block_group(struct super_block *sb, |
1466 | ext4_fsblk_t blocknr); | |
1467 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
1468 | ext4_fsblk_t blocknr); | |
fd2d4291 AM |
1469 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
1470 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1471 | ext4_group_t group); | |
7061eba7 | 1472 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
617ba13b | 1473 | ext4_fsblk_t goal, unsigned long *count, int *errp); |
5c791616 | 1474 | extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
8c3bf8a0 | 1475 | extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
e21675d4 AK |
1476 | extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, |
1477 | ext4_fsblk_t block, unsigned long count); | |
af5bc92d TT |
1478 | extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); |
1479 | extern void ext4_check_blocks_bitmap(struct super_block *); | |
617ba13b | 1480 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
fd2d4291 | 1481 | ext4_group_t block_group, |
ac27a0ec | 1482 | struct buffer_head ** bh); |
617ba13b | 1483 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
bb23c20a TT |
1484 | struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, |
1485 | ext4_group_t block_group); | |
1486 | extern unsigned ext4_init_block_bitmap(struct super_block *sb, | |
1487 | struct buffer_head *bh, | |
1488 | ext4_group_t group, | |
1489 | struct ext4_group_desc *desc); | |
1490 | #define ext4_free_blocks_after_init(sb, group, desc) \ | |
1491 | ext4_init_block_bitmap(sb, NULL, group, desc) | |
ac27a0ec DK |
1492 | |
1493 | /* dir.c */ | |
617ba13b MC |
1494 | extern int ext4_check_dir_entry(const char *, struct inode *, |
1495 | struct ext4_dir_entry_2 *, | |
498e5f24 | 1496 | struct buffer_head *, unsigned int); |
617ba13b | 1497 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 1498 | __u32 minor_hash, |
617ba13b MC |
1499 | struct ext4_dir_entry_2 *dirent); |
1500 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
1501 | |
1502 | /* fsync.c */ | |
af5bc92d | 1503 | extern int ext4_sync_file(struct file *, struct dentry *, int); |
ac27a0ec DK |
1504 | |
1505 | /* hash.c */ | |
617ba13b | 1506 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
1507 | dx_hash_info *hinfo); |
1508 | ||
1509 | /* ialloc.c */ | |
f157a4aa | 1510 | extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, |
11013911 | 1511 | const struct qstr *qstr, __u32 goal); |
af5bc92d TT |
1512 | extern void ext4_free_inode(handle_t *, struct inode *); |
1513 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
1514 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
1515 | extern unsigned long ext4_count_dirs(struct super_block *); | |
1516 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
bb23c20a TT |
1517 | extern unsigned ext4_init_inode_bitmap(struct super_block *sb, |
1518 | struct buffer_head *bh, | |
1519 | ext4_group_t group, | |
1520 | struct ext4_group_desc *desc); | |
1521 | extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); | |
ac27a0ec | 1522 | |
c9de560d AT |
1523 | /* mballoc.c */ |
1524 | extern long ext4_mb_stats; | |
1525 | extern long ext4_mb_max_to_scan; | |
1526 | extern int ext4_mb_init(struct super_block *, int); | |
1527 | extern int ext4_mb_release(struct super_block *); | |
1528 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
1529 | struct ext4_allocation_request *, int *); | |
1530 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
c2ea3fde | 1531 | extern void ext4_discard_preallocations(struct inode *); |
c9de560d AT |
1532 | extern int __init init_ext4_mballoc(void); |
1533 | extern void exit_ext4_mballoc(void); | |
44338711 | 1534 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
e6362609 TT |
1535 | struct buffer_head *bh, ext4_fsblk_t block, |
1536 | unsigned long count, int flags); | |
920313a7 | 1537 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
5f21b0e6 | 1538 | ext4_group_t i, struct ext4_group_desc *desc); |
920313a7 AK |
1539 | extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); |
1540 | extern void ext4_mb_put_buddy_cache_lock(struct super_block *, | |
1541 | ext4_group_t, int); | |
ac27a0ec | 1542 | /* inode.c */ |
725d26d3 AK |
1543 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, |
1544 | ext4_lblk_t, int, int *); | |
1545 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
1546 | ext4_lblk_t, int, int *); | |
6873fa0d ES |
1547 | int ext4_get_block(struct inode *inode, sector_t iblock, |
1548 | struct buffer_head *bh_result, int create); | |
ac27a0ec | 1549 | |
1d1fe1ee | 1550 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
a9185b41 | 1551 | extern int ext4_write_inode(struct inode *, struct writeback_control *); |
af5bc92d | 1552 | extern int ext4_setattr(struct dentry *, struct iattr *); |
3e3398a0 MC |
1553 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1554 | struct kstat *stat); | |
af5bc92d TT |
1555 | extern void ext4_delete_inode(struct inode *); |
1556 | extern int ext4_sync_inode(handle_t *, struct inode *); | |
617ba13b MC |
1557 | extern void ext4_dirty_inode(struct inode *); |
1558 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
1559 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
91ef4caf | 1560 | extern int ext4_can_truncate(struct inode *inode); |
af5bc92d | 1561 | extern void ext4_truncate(struct inode *); |
487caeef | 1562 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); |
617ba13b | 1563 | extern void ext4_set_inode_flags(struct inode *); |
ff9ddf7e | 1564 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
ccd2506b | 1565 | extern int ext4_alloc_da_blocks(struct inode *inode); |
617ba13b | 1566 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 | 1567 | extern int ext4_writepage_trans_blocks(struct inode *); |
a02908f1 | 1568 | extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); |
f3bd1f3f | 1569 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
cf108bca | 1570 | extern int ext4_block_truncate_page(handle_t *handle, |
a86c6181 | 1571 | struct address_space *mapping, loff_t from); |
c2ec175c | 1572 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
a9e7f447 | 1573 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
c7064ef1 | 1574 | extern int flush_completed_IO(struct inode *inode); |
5f634d06 AK |
1575 | extern void ext4_da_update_reserve_space(struct inode *inode, |
1576 | int used, int quota_claim); | |
ac27a0ec | 1577 | /* ioctl.c */ |
5cdd7b2d | 1578 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
af5bc92d | 1579 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
ac27a0ec | 1580 | |
c14c6fd5 | 1581 | /* migrate.c */ |
2a43a878 | 1582 | extern int ext4_ext_migrate(struct inode *); |
3d0518f4 | 1583 | |
ac27a0ec | 1584 | /* namei.c */ |
3d0518f4 WY |
1585 | extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); |
1586 | extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); | |
617ba13b MC |
1587 | extern int ext4_orphan_add(handle_t *, struct inode *); |
1588 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
1589 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
1590 | __u32 start_minor_hash, __u32 *next_hash); |
1591 | ||
1592 | /* resize.c */ | |
617ba13b MC |
1593 | extern int ext4_group_add(struct super_block *sb, |
1594 | struct ext4_new_group_data *input); | |
1595 | extern int ext4_group_extend(struct super_block *sb, | |
1596 | struct ext4_super_block *es, | |
1597 | ext4_fsblk_t n_blocks_count); | |
ac27a0ec DK |
1598 | |
1599 | /* super.c */ | |
12062ddd | 1600 | extern void __ext4_error(struct super_block *, const char *, const char *, ...) |
ac27a0ec | 1601 | __attribute__ ((format (printf, 3, 4))); |
12062ddd | 1602 | #define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message) |
273df556 FM |
1603 | extern void ext4_error_inode(const char *, struct inode *, const char *, ...) |
1604 | __attribute__ ((format (printf, 3, 4))); | |
1605 | extern void ext4_error_file(const char *, struct file *, const char *, ...) | |
ac27a0ec | 1606 | __attribute__ ((format (printf, 3, 4))); |
af5bc92d TT |
1607 | extern void __ext4_std_error(struct super_block *, const char *, int); |
1608 | extern void ext4_abort(struct super_block *, const char *, const char *, ...) | |
ac27a0ec | 1609 | __attribute__ ((format (printf, 3, 4))); |
12062ddd ES |
1610 | extern void __ext4_warning(struct super_block *, const char *, |
1611 | const char *, ...) | |
ac27a0ec | 1612 | __attribute__ ((format (printf, 3, 4))); |
12062ddd | 1613 | #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message) |
b31e1552 ES |
1614 | extern void ext4_msg(struct super_block *, const char *, const char *, ...) |
1615 | __attribute__ ((format (printf, 3, 4))); | |
5d1b1b3f AK |
1616 | extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, |
1617 | const char *, const char *, ...) | |
1618 | __attribute__ ((format (printf, 4, 5))); | |
af5bc92d | 1619 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
99e6f829 AK |
1620 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
1621 | __u32 compat); | |
1622 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
1623 | struct super_block *sb, __u32 rocompat); | |
1624 | extern int ext4_update_incompat_feature(handle_t *handle, | |
1625 | struct super_block *sb, __u32 incompat); | |
8fadc143 AR |
1626 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
1627 | struct ext4_group_desc *bg); | |
1628 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
1629 | struct ext4_group_desc *bg); | |
1630 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
1631 | struct ext4_group_desc *bg); | |
560671a0 AK |
1632 | extern __u32 ext4_free_blks_count(struct super_block *sb, |
1633 | struct ext4_group_desc *bg); | |
1634 | extern __u32 ext4_free_inodes_count(struct super_block *sb, | |
1635 | struct ext4_group_desc *bg); | |
1636 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
1637 | struct ext4_group_desc *bg); | |
1638 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
1639 | struct ext4_group_desc *bg); | |
8fadc143 AR |
1640 | extern void ext4_block_bitmap_set(struct super_block *sb, |
1641 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1642 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
1643 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1644 | extern void ext4_inode_table_set(struct super_block *sb, | |
1645 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
560671a0 AK |
1646 | extern void ext4_free_blks_set(struct super_block *sb, |
1647 | struct ext4_group_desc *bg, __u32 count); | |
1648 | extern void ext4_free_inodes_set(struct super_block *sb, | |
1649 | struct ext4_group_desc *bg, __u32 count); | |
1650 | extern void ext4_used_dirs_set(struct super_block *sb, | |
1651 | struct ext4_group_desc *bg, __u32 count); | |
1652 | extern void ext4_itable_unused_set(struct super_block *sb, | |
1653 | struct ext4_group_desc *bg, __u32 count); | |
bb23c20a TT |
1654 | extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, |
1655 | struct ext4_group_desc *gdp); | |
1656 | extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, | |
1657 | struct ext4_group_desc *gdp); | |
bd81d8ee LV |
1658 | |
1659 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
1660 | { | |
1661 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 1662 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
1663 | } |
1664 | ||
1665 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
1666 | { | |
1667 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
308ba3ec | 1668 | le32_to_cpu(es->s_r_blocks_count_lo); |
bd81d8ee LV |
1669 | } |
1670 | ||
1671 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
1672 | { | |
1673 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
308ba3ec | 1674 | le32_to_cpu(es->s_free_blocks_count_lo); |
bd81d8ee LV |
1675 | } |
1676 | ||
1677 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
1678 | ext4_fsblk_t blk) | |
1679 | { | |
6bc9feff | 1680 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1681 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
1682 | } | |
1683 | ||
1684 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
1685 | ext4_fsblk_t blk) | |
1686 | { | |
308ba3ec | 1687 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1688 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
1689 | } | |
1690 | ||
1691 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
1692 | ext4_fsblk_t blk) | |
1693 | { | |
308ba3ec | 1694 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1695 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
1696 | } | |
1697 | ||
a48380f7 AK |
1698 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
1699 | { | |
06a279d6 TT |
1700 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
1701 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
1702 | le32_to_cpu(raw_inode->i_size_lo); | |
1703 | else | |
1704 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
a48380f7 | 1705 | } |
bd81d8ee | 1706 | |
a48380f7 AK |
1707 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
1708 | { | |
1709 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
1710 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
1711 | } | |
ac27a0ec | 1712 | |
c9de560d AT |
1713 | static inline |
1714 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
af5bc92d | 1715 | ext4_group_t group) |
c9de560d AT |
1716 | { |
1717 | struct ext4_group_info ***grp_info; | |
1718 | long indexv, indexh; | |
1719 | grp_info = EXT4_SB(sb)->s_group_info; | |
1720 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
1721 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
1722 | return grp_info[indexv][indexh]; | |
1723 | } | |
1724 | ||
8df9675f TT |
1725 | /* |
1726 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
1727 | * the locking protocol documented in the comments of ext4_group_add() | |
1728 | * in resize.c | |
1729 | */ | |
1730 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
1731 | { | |
1732 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
1733 | ||
1734 | smp_rmb(); | |
1735 | return ngroups; | |
1736 | } | |
c9de560d | 1737 | |
772cb7c8 JS |
1738 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
1739 | ext4_group_t block_group) | |
1740 | { | |
1741 | return block_group >> sbi->s_log_groups_per_flex; | |
1742 | } | |
1743 | ||
1744 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
1745 | { | |
1746 | return 1 << sbi->s_log_groups_per_flex; | |
1747 | } | |
1748 | ||
617ba13b | 1749 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
1750 | do { \ |
1751 | if ((errno)) \ | |
4db9c54a | 1752 | __ext4_std_error((sb), __func__, (errno)); \ |
ac27a0ec DK |
1753 | } while (0) |
1754 | ||
a30d542a | 1755 | #ifdef CONFIG_SMP |
179f7ebf | 1756 | /* Each CPU can accumulate percpu_counter_batch blocks in their local |
a30d542a | 1757 | * counters. So we need to make sure we have free blocks more |
179f7ebf | 1758 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
a30d542a | 1759 | */ |
179f7ebf | 1760 | #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
a30d542a AK |
1761 | #else |
1762 | #define EXT4_FREEBLOCKS_WATERMARK 0 | |
1763 | #endif | |
1764 | ||
cf17fea6 AK |
1765 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
1766 | { | |
1767 | /* | |
1768 | * XXX: replace with spinlock if seen contended -bzzz | |
1769 | */ | |
1770 | down_write(&EXT4_I(inode)->i_data_sem); | |
1771 | if (newsize > EXT4_I(inode)->i_disksize) | |
1772 | EXT4_I(inode)->i_disksize = newsize; | |
1773 | up_write(&EXT4_I(inode)->i_data_sem); | |
1774 | return ; | |
1775 | } | |
a30d542a | 1776 | |
5d1b1b3f AK |
1777 | struct ext4_group_info { |
1778 | unsigned long bb_state; | |
1779 | struct rb_root bb_free_root; | |
a36b4498 ES |
1780 | ext4_grpblk_t bb_first_free; /* first free block */ |
1781 | ext4_grpblk_t bb_free; /* total free blocks */ | |
1782 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ | |
8a57d9d6 | 1783 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
5d1b1b3f AK |
1784 | struct list_head bb_prealloc_list; |
1785 | #ifdef DOUBLE_CHECK | |
1786 | void *bb_bitmap; | |
1787 | #endif | |
1788 | struct rw_semaphore alloc_sem; | |
a36b4498 ES |
1789 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
1790 | * regions, index is order. | |
1791 | * bb_counters[3] = 5 means | |
1792 | * 5 free 8-block regions. */ | |
5d1b1b3f AK |
1793 | }; |
1794 | ||
1795 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 | |
5d1b1b3f AK |
1796 | |
1797 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
1798 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
1799 | ||
50797481 TT |
1800 | #define EXT4_MAX_CONTENTION 8 |
1801 | #define EXT4_CONTENTION_THRESHOLD 2 | |
1802 | ||
955ce5f5 AK |
1803 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
1804 | ext4_group_t group) | |
5d1b1b3f | 1805 | { |
955ce5f5 AK |
1806 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
1807 | } | |
5d1b1b3f | 1808 | |
50797481 TT |
1809 | /* |
1810 | * Returns true if the filesystem is busy enough that attempts to | |
1811 | * access the block group locks has run into contention. | |
1812 | */ | |
1813 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) | |
1814 | { | |
1815 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); | |
1816 | } | |
1817 | ||
955ce5f5 AK |
1818 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
1819 | { | |
50797481 TT |
1820 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
1821 | if (spin_trylock(lock)) | |
1822 | /* | |
1823 | * We're able to grab the lock right away, so drop the | |
1824 | * lock contention counter. | |
1825 | */ | |
1826 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); | |
1827 | else { | |
1828 | /* | |
1829 | * The lock is busy, so bump the contention counter, | |
1830 | * and then wait on the spin lock. | |
1831 | */ | |
1832 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, | |
1833 | EXT4_MAX_CONTENTION); | |
1834 | spin_lock(lock); | |
1835 | } | |
5d1b1b3f AK |
1836 | } |
1837 | ||
1838 | static inline void ext4_unlock_group(struct super_block *sb, | |
1839 | ext4_group_t group) | |
1840 | { | |
955ce5f5 | 1841 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
5d1b1b3f AK |
1842 | } |
1843 | ||
ac27a0ec DK |
1844 | /* |
1845 | * Inodes and files operations | |
1846 | */ | |
1847 | ||
1848 | /* dir.c */ | |
617ba13b | 1849 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
1850 | |
1851 | /* file.c */ | |
c5ef1c42 | 1852 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 1853 | extern const struct file_operations ext4_file_operations; |
ac27a0ec DK |
1854 | |
1855 | /* namei.c */ | |
c5ef1c42 AV |
1856 | extern const struct inode_operations ext4_dir_inode_operations; |
1857 | extern const struct inode_operations ext4_special_inode_operations; | |
596397b7 | 1858 | extern struct dentry *ext4_get_parent(struct dentry *child); |
ac27a0ec DK |
1859 | |
1860 | /* symlink.c */ | |
c5ef1c42 AV |
1861 | extern const struct inode_operations ext4_symlink_inode_operations; |
1862 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 1863 | |
6fd058f7 TT |
1864 | /* block_validity */ |
1865 | extern void ext4_release_system_zone(struct super_block *sb); | |
1866 | extern int ext4_setup_system_zone(struct super_block *sb); | |
1867 | extern int __init init_ext4_system_zone(void); | |
1868 | extern void exit_ext4_system_zone(void); | |
1869 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, | |
1870 | ext4_fsblk_t start_blk, | |
1871 | unsigned int count); | |
1872 | ||
a86c6181 AT |
1873 | /* extents.c */ |
1874 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
1875 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
a02908f1 MC |
1876 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, |
1877 | int chunk); | |
e35fd660 TT |
1878 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
1879 | struct ext4_map_blocks *map, int flags); | |
cf108bca | 1880 | extern void ext4_ext_truncate(struct inode *); |
a86c6181 AT |
1881 | extern void ext4_ext_init(struct super_block *); |
1882 | extern void ext4_ext_release(struct super_block *); | |
a2df2a63 AA |
1883 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, |
1884 | loff_t len); | |
0031462b | 1885 | extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, |
a1de02dc | 1886 | ssize_t len); |
e35fd660 TT |
1887 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
1888 | struct ext4_map_blocks *map, int flags); | |
12b7ac17 TT |
1889 | extern int ext4_get_blocks(handle_t *handle, struct inode *inode, |
1890 | sector_t block, unsigned int max_blocks, | |
c2177057 | 1891 | struct buffer_head *bh, int flags); |
3a06d778 AK |
1892 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1893 | __u64 start, __u64 len); | |
748de673 AF |
1894 | /* move_extent.c */ |
1895 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
1896 | __u64 start_orig, __u64 start_donor, | |
1897 | __u64 len, __u64 *moved_len); | |
1898 | ||
3a06d778 | 1899 | |
744692dc JZ |
1900 | /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ |
1901 | enum ext4_state_bits { | |
1902 | BH_Uninit /* blocks are allocated but uninitialized on disk */ | |
1903 | = BH_JBDPrivateStart, | |
1904 | }; | |
1905 | ||
1906 | BUFFER_FNS(Uninit, uninit) | |
1907 | TAS_BUFFER_FNS(Uninit, uninit) | |
1908 | ||
2ccb5fb9 AK |
1909 | /* |
1910 | * Add new method to test wether block and inode bitmaps are properly | |
1911 | * initialized. With uninit_bg reading the block from disk is not enough | |
1912 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
1913 | */ | |
1914 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
1915 | ||
1916 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
1917 | { | |
1918 | return (buffer_uptodate(bh) && | |
1919 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
1920 | } | |
1921 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
1922 | { | |
1923 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
1924 | } | |
1925 | ||
731eb1a0 AM |
1926 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
1927 | ||
ac27a0ec DK |
1928 | #endif /* __KERNEL__ */ |
1929 | ||
3dcf5451 | 1930 | #endif /* _EXT4_H */ |